Jet Stirred Reactor profiles.

[rwest]

We want to work towards evaluating models against JSR species profile data.
Quite a lot of PyTeCK currently assumes the only thing it ever tries to do is ignition delays, so we'd need to do some restructuring before we can start.

Thoughts?

• Make a parent class and subclasses, with methods like evaluate_model etc?
• Make modules for ignition and jsr each with classes like Simulation?
• Make Simulation parent class, with JSRSimulation and IgnitionSimulation as subclasses (the latter being the current Simulation class)?

Guidance appreciated. Happy to chat if that's more efficient.